Gorgeous looking game!
I'm not sure if it is a bug, but if you press return to title via Game End, then you'll be sent to a different title screen. Start a new game in it, and the isometric view will be replaced with the default bird's eye view. The game still runs fine, though.
I also noticed a few typos, particularly in the intro (I'd recommend slowing it down too as it's hard to read).
But other than that, great work! I'm gonna like mapping this one.